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S4vecs

S4vec-times

Signature
(s4vec-times x y) → res
Arguments: x — Guard (s4vec-p x).; y — Guard (s4vec-p y).
Returns: res — Type (s4vec-p res).

Definitions and Theorems

Function: s4vec-times

(defun s4vec-times (x y)
  (declare (xargs :guard (and (s4vec-p x) (s4vec-p y))))
  (let ((__function__ 's4vec-times))
    (declare (ignorable __function__))
    (b* (((unless (and (s4vec-2vec-p x) (s4vec-2vec-p y)))
          (s4vec-x))
         (xval (s4vec-sparseint-val (s4vec->upper x)))
         (yval (s4vec-sparseint-val (s4vec->upper y))))
      (s2vec (int-to-sparseint (* xval yval))))))

Theorem: s4vec-p-of-s4vec-times

(defthm s4vec-p-of-s4vec-times
  (b* ((res (s4vec-times x y)))
    (s4vec-p res))
  :rule-classes :rewrite)

Theorem: s4vec-times-correct

(defthm s4vec-times-correct
  (b* ((?res (s4vec-times x y)))
    (equal (s4vec->4vec res)
           (4vec-times (s4vec->4vec x)
                       (s4vec->4vec y)))))

Theorem: s4vec-times-of-s4vec-fix-x

(defthm s4vec-times-of-s4vec-fix-x
  (equal (s4vec-times (s4vec-fix x) y)
         (s4vec-times x y)))

Theorem: s4vec-times-s4vec-equiv-congruence-on-x

(defthm s4vec-times-s4vec-equiv-congruence-on-x
  (implies (s4vec-equiv x x-equiv)
           (equal (s4vec-times x y)
                  (s4vec-times x-equiv y)))
  :rule-classes :congruence)

Theorem: s4vec-times-of-s4vec-fix-y

(defthm s4vec-times-of-s4vec-fix-y
  (equal (s4vec-times x (s4vec-fix y))
         (s4vec-times x y)))

Theorem: s4vec-times-s4vec-equiv-congruence-on-y

(defthm s4vec-times-s4vec-equiv-congruence-on-y
  (implies (s4vec-equiv y y-equiv)
           (equal (s4vec-times x y)
                  (s4vec-times x y-equiv)))
  :rule-classes :congruence)